YARN-841. Move Auxiliary service to yarn-api, annotate and document it. Contributed by Vinod Kumar Vavilapalli.
svn merge --ignore-ancestry -c 1494031 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1494032 13f79535-47bb-0310-9956-ffa450edef68
Merge -c 1494035 from trunk to branch-2 to fix YARN-799. Fix CgroupsLCEResourcesHandler to use /tasks instead of /cgroup.procs. Contributed by Chris Riccomini.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1494036 13f79535-47bb-0310-9956-ffa450edef68
YARN-846.  Move pb Impl classes from yarn-api to yarn-common. Contributed by Jian He.
svn merge --ignore-ancestry -c 1494052 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1494053 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/branch-2' into branch-2-gd
Merge remote branch 'origin/branch-2-gd' into fb-HADOOP-9016-branch-2-gd